Here Hilton is still listed:
https://www.miles-and-more.com/de/en...on-honors.html
So, I assume they are still a partner, but yes... kind of very little information on that website. But so far, I found every hotel-airline FFP partnership quite disappointing in value when crediting from one to the other (e.g. getting miles for the airline FFP instead of points to the hotel FFP.) Transferring between the programs is usually even more insulating, like Radisson giving 1000 miles to SK EB for 10.000 Radisson points. :/